#include<bits/stdc++.h>
using namespace std;

int a[200005];

int main(){
    freopen("color.in","r",stdin);
    freopen("color.out","w",stdout);
    int t;
    cin>>t;
    for(int i=1;i<=t;i++){
        int n;cin>>n;
        for(int j=1;j<=n;j++){
            cin>>a[j];
        }
        cout<<0<<endl;
    }
    return 0;
}
